TM
5-3431-203-15
c. Installation.
4-21. Intensity Selector
(1) Refer to figure 4-5 and install the in-
a. Removal.
tensity selector.
(2) Close and lock the panel door.
(1) Unlock the lower panel door.
(2) Refer to figure 4-5 and remove the
intensity selector.
b. Testing.
(1) Connect an ohmmeter to the outside
terminals of the selector, and set the
meter on the RX1 scale. The read-
ing should be 2 ohms. If the read-
ing is more or less than 2 ohms re-
place the intensity selector.
(2) Connect the ohmmeter to the center
terminal and either outside terminal.
Set the meter on the RX1 scale.
Turn the intensity selector in a clock-
wise direction until it stops; the me-
ter should have a zero reading. Then
turn the intensity selector in a coun-
terclockwise direction until it stops.
The reading should be 2 ohms. If
the readings are not as described, re-
place the intensity selector.
Note. Make sure that the ohmmeter used
for the above tests is in proper working
Figure 4-5. Intensity selector, removal and
condition.
installation.
Section VII. CONTROL RECTIFIER, RECTIFIER ASSEMBLY, DIODES,
CAPACITORS, AND RESISTORS
b. Installation.
4-22. Control Rectifier
(1) Refer to figure 4-6 and install the
a. Removal.
control rectifier.
(2) Install the welding machine top and
(1) Remove the welding machine top and
housing (para 3-26).
housing (para 3-26),
(2) Refer to figure 4-6 and remove the
4-23. Rectifier Assembly
control rectifier.
a. Removal.
(1) Remove the welding machine top and
Warning: When malfunction of
housing (para 3-26).
the selenium rectifier occurs, thor-
(2) Refer to figure 4-7 and remove the
oughly ventilate the area to prevent
rectifier assembly.
inhalation of poisonous fumes. Do
b. Disassembly and Reassembly. Refer to
not handle the damaged rectifier
figure 4-8 and disassemble and reassemble
while it is warm, to avoid absorption
the rectifier assembly.
of the poisonous selenium oxide com-
c. Installation.
pound through the skin. Failure to
observe this warning can result in
(1) Refer to figure 4-7 and install the
rectifier assembly.
serious injury or death.